c# .net

how to create a Autocomplete textBox using Asp.net C#?

how to create a Autocomplete textBox using Asp.net C#? , someone asked me to explain?

In this article I will explain how to create a autocomplete textbox using C# in ASP.Net.

Design a Search box and reference the jquery and paste the javascript code  in  exampleSearch.aspx

<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">

 <link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery-ui.css" rel="stylesheet" type="text/css" />
    <script language="javascript"  type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.5/jquery.min.js"></script>  
    <script language="javascript"  type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js"></script> 
Search: &nbsp; &nbsp; <asp:TextBox ID="txtSearch" runat="server"></asp:TextBox>
<script type="text/javascript">
$(document).ready(function () {
        source: function (request, response) {
            var param = { keyword: $('#MainContent_txtSearch').val() };
                url: "Default.aspx/GetSearchResults",
                data: JSON.stringify(param),
                dataType: "json",
                type: "POST",
                contentType: "application/json; charset=utf-8",
                success: function (data) {
                    response( $.map(data.d, function (item) {
                        return {
                            value: item
                error: function (XMLHttpRequest, textStatus, errorThrown) {
        select: function (event, ui) {
            if (ui.item) {
        minLength: 2

In exampleSearch.aspx.cs paste the webservice code and modiyfy SQL command as per your requirement. In webconfig change the connection String give datasource, user name and password of sql server.
public static string[] GetSearchResults(string keyword)
List<string> country = new List<string>();
string query = string.Format("SELECT DISTINCT Title FROM Post WHERE Title LIKE '%{0}%'", keyword);

using (SqlConnection con =
new SqlConnection(ConfigurationManager.ConnectionStrings["ApplicationServices"].ConnectionString))
using (SqlCommand cmd = new SqlCommand(query, con))
SqlDataReader reader = cmd.ExecuteReader();

while (reader.Read())

return country.ToArray();


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